note hv [[renodino]] has been unable to find a binary edit utility for the Linux platform. For setting stacksize, you need the API function setrlimit(2); the manpage refers you also to the bash builtin 'ulimit' and quotactl(1). Trying that locally against an example from [id://532616]:<c> zen% ulimit -s 8192 zen% perl -wle '$n=shift; $_="a" x $n; /(ab*)+/' 10080 Segmentation fault (core dumped) zen% ulimit -s 32768 zen% perl -wle '$n=shift; $_="a" x $n; /(ab*)+/' 10080 zen% perl -wle '$n=shift; $_="a" x $n; /(ab*)+/' 32766 zen% perl -wle '$n=shift; $_="a" x $n; /(ab*)+/' 32767 Complex regular subexpression recursion limit (32766) exceeded at -e line 1. zen% </c>.. which gets me to the builtin limit. Note that the limit may be capped by root, and that more complex systems may use the quota-based accounting method; but any barriers are there to stop people increasing stack size, so they shouldn't cause a problem for your requirements here. HTH, Hugo 532956 532956